MY ENGINE KNOCKS AFTER DRIVING A FEW MILES

I have a 1985 nissan 300zx turbo and recently I started experiencing a loud knocking noise from the engine after driving the car a few miles. I get on the freeway then 15 minutes later when I exit and come to a stop I can hear the noise. Sounds "clank clank clank"

a rod is an internal part of you engine attatched to a piston on the bottom part of the motor. one of those is going to break throguh the side of your motor.its called a roda rod is an internal part of you engine attatched to a piston on the bottom part of the motor. one of those is going to break throguh the side of your motor.its called a rod

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You didnt state vehicle however if the engine knocks the knock sensor will back off the timing thinking its detination not an actual knock if its knocking loudly stop driving it, something is going to let loose

I would expect the engine is damaged.
You'll need to check the oil pressure and try to narrow down the area where the sound is coming from to proceed.
A very loud knock is probably a piston or rod bearing.

If it is knocking sounds like you may have broke a piston rod. I would not drive it because its cheaper to have it fixed now if you keep driving it the rod will most likelt come thru the block then your looking at replacing the whole engine. Good luck

the chances are you have done the shell bearings on the cranck shat in or the big ends if it is a loud knocking noise or possibly the turbo (is their any smoke from engine bluey in colour if this is so engine has been damaged it could also be the camshaft too without hearing it it could be anything )hope i have helped you

a noise in the engine is not a good news but you have 70% chance that you engine crank shaft and parts arround it are bad. in some case if your car is auttomatic ,a crack in the flight weell may cause the "knocking sound " please ck you fly w before you make decisions .if you engine is bad ..,, change it .it will cost you more to try to fix it

Definitely sound like a rod insert to me. With my practiced ear, I cna tell the difference between a main bearing knock (deeper sound, more of a thudding noise), rod bearing knock (not so deep, gets louder as the engine revs, kind of a rat-tat-tat-tapping noise), and a wrist-pin knock (not quite as loud or deep and gets louder with decelerating RPM).

You can tell which cylinder the knock is on by removing the spark wires to each cylinder one at a time while the engine is still cold enough to knock. (Don't get shocked!)... when you hit the right one, the knock will noticeably quieten or possibly quit altogether!

The 300 Six is a tough old motor and I have seen them survive for years with rod knocks... Just allow the engine ample warm-up time before driving, drive on the conservative side, and keep an eye on oil level and pressure.

An oil and filter change to a higher viscosity oil with a can of STP Oil Treatment (Or something similar) is a good band-aid fix for now, I would recommend Castrol GTX 20/50w... in my opinion, Castrol is the best brand out there, I use it religiously - - - I have a customer with a Chevy Suburban who has followed my advice and adhered to good maintenance discipline that has racked up over 300,000 miles on the original small block and no consumption or engine issues, and is still running strong!

Bill, the temporary fix will work for a while, hopefully a long while --- BUT when it reaches the point that the knock doesn't go away, it is time to park it until the real repair can be done --- otherwise you risk throwing a rod and destroying your engine beyond repair!!!

Please don't hesitate to post a comment or ask if you have further questions. I hope this information answers your question and concerns and wish you well with the Ford. *** And remember to rate my assistance... Your rating is my only compensation for helping you in the free blog!!!***